1) Round tube folding type aluminium alloy climbing ladder is one one the developed aluminum staircases in our company
2) According to the customers’ need, on the basic of pipe climbing ladder, we add a secondary ladder which can turn on the fixed straight ladder
http://www.jlfiretruck.com/aluminum-staircase/round-tube-aluminum-staircase/round-tube-folding-aluminum-staircase.html